The traffic was thinning a little before the doctor spoke.

They are heard in the darkness when the traffic thins.

As they worked their way into the suburbs, the traffic thinned and a light snow began.

The traffic had thinned somewhat; rush hour was almost over for the morning.

The streetlights had come on, and the traffic below was thinning.

Within half an hour, the traffic in the plaza had thinned dramatically.

Note that in winter, when traffic thins, many facilities are closed.

The traffic thinned a bit once they had left Manila proper, and he started looking for a place to make his move.

The end of the High Street appeared; the traffic thinned.

Traffic was thinning dramatically, and soon theirs would be one of the few cars left on the highway.